200MW燃煤炉分级燃烧及NO_x减排的数值研究  

Numerical Study of a 200 MW Coal-fired Boiler for Using Staged Combustion and NO_x Reduction Measures

作　　者：刘文华[1] 杨茉[1] 李峥[1] 王治云[1] 陆威[1] 

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《工程热物理学报》2016年第12期2590-2593,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51476103);上海市教育委员会科研创新项目(No.14ZZ134);上海浦江计划(No.14PJ1407000)

摘　　要：本文针对某电厂200 MW四角切圆燃煤锅炉,采用数值方法,模拟了其额定工况采用和不采用分级燃烧以及不同分级燃尽风比率下炉内流场,温度场及NO_x的生成情况,探讨通过分级燃烧减少NO_x排放的方法。结果表明,在原来不采用分级燃烧的额定工况,数值模拟结果与设计值和在实际运行中的测试结果吻合良好,表明数值模拟基本符合实际;炉膛主燃区氧量过大是导致炉膛生成的NO_x浓度较高的重要原因,采用分级燃烧能够显著降低炉膛NO_x生成量;在本文计算条件下,当燃尽风比例占15%时NO_x生成量最小。This paper studied a 200 MW tangentially coal-fired boiler. Numerical simulation methods are used to study the furnace flow field, temperature field and the characteristics of NOx emissions under BMCR condition with/without staged combustion and different separated over-fire air ratios, and thus discuss the methods to reduce NOx emissions by staged combustion. It turns out that the numerical calculating results correspond well with the design value under BMCR condition without staged combustion. The main cause of the higher concentration of NOx emissions is that the chamber excess air coefficient is large. While the NOx concentration at the furnace exit decreases significantly after the installation of staged combustion system. When SOFA ratio is 15%, NOx emission is minimum.

关 键 词：切圆燃烧 NOX排放 分离燃尽风 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]